
Good breeders (this is in my breed) will often use a young male at around a year old, on a suitable bitch in their own kennels for the experience and to see what he might throw. After that they put that on the back-burner and concentrate on a show career. If the dog does well, and attracts interest, they may offer him at stud (to strictly approved bitches). As I really didn't have a kennel full of bitches who weren't all related, with mine I'd let a male attracting interest (and mine did for their overseas lines alone) be used on the understanding he wasn't proven - and I'd not take a fee until there was a litter on the ground. Fact is I turned more enquiries down, than not for the simple reason that not only is putting two untried lines together an unknown, it's usually the 'fault of the stud dog' if the unexpected happened!!
We do the gonioscopy test in my main breed although at the time I was breeding I only tested if a problem appeared - so no need to wait for Hip and Elbow scoring.
This situation with the Lab. smacks of 'kerching' and for sure, I'd need to see Hip and Elbow scores before using the dog. Further, if the dog is being a nuisance, before he's been allowed to mate, heaven help them once he has been! Or even if he's not humping now.
Serious sway - poor hips, probably.